Function point_lit_specular

pub fn point_lit_specular(
    location: impl Into<Point3>,
    light_color: impl Into<Color>,
    surface_scale: scalar,
    ks: scalar,
    shininess: scalar,
    input: impl Into<Option<ImageFilter>>,
    crop_rect: impl Into<CropRect>,
) -> Option<ImageFilter>

Create a filter that calculates the specular illumination from a point light source, using alpha channel of the input as the height profile of the surface (to approximate normal vectors).

• location - The location of the point light.
• light_color - The color of the specular light source.
• surface_scale - Scale factor to transform from alpha values to physical height.
• ks - Specular reflectance coefficient.
• shininess - The specular exponent determining how shiny the surface is.
• input - The input filter that defines surface normals (as alpha), or uses the source bitmap when None.
• crop_rect - Optional rectangle that crops the input and output.